arch/sh/include/asm/cmpxchg-cas.h

   1 #ifndef __ASM_SH_CMPXCHG_CAS_H
   2 #define __ASM_SH_CMPXCHG_CAS_H
   3
   4 static inline unsigned long
   5 __cmpxchg_u32(volatile u32 *m, unsigned long old, unsigned long new)
   6 {
   7         __asm__ __volatile__("cas.l %1,%0,@r0"
   8                 : "+r"(new)
   9                 : "r"(old), "z"(m)
  10                 : "t", "memory" );
  11         return new;
  12 }
  13
  14 static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
  15 {
  16         unsigned long old;
  17         do old = *m;
  18         while (__cmpxchg_u32(m, old, val) != old);
  19         return old;
  20 }
  21
  22 #include <asm/cmpxchg-xchg.h>
  23
  24 #endif /* __ASM_SH_CMPXCHG_CAS_H */